What makes the inteview style so difficult is the right answer is more about process than a specific number or result. And, as you'll see, the question topics are about random situations that can't be prepared for specifically.

Management consulting interview expert Victor Cheng of caseinterview.com says questions usually come in two varieties: short, five minute estimation questions where the candidate isn't permitted to ask for any additional information, and 30 to 40 minute "case interview" questions where it's expected that the candidate ask for quantitative information from the interviewer.